 /*******************************************************************************
  * Copyright (c) 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.core.internal.registry.osgi;

 import org.eclipse.core.internal.registry.RegistryMessages;
 import org.eclipse.core.internal.runtime.RuntimeLog;
 import org.eclipse.core.runtime.*;
 import org.eclipse.core.runtime.spi.IRegistryProvider;
 import org.osgi.framework.BundleContext;
 import org.osgi.util.tracker.ServiceTracker;

 public final class RegistryProviderOSGI implements IRegistryProvider {

     private ServiceTracker registryTracker = null;

     /* (non-Javadoc)
      * @see org.eclipse.equinox.registry.IRegistryProvider#getRegistry()
      */
     public IExtensionRegistry getRegistry() {
         if (registryTracker == null) {
             BundleContext context = Activator.getContext();
             if (context == null) {
                 RuntimeLog.log(new Status(IStatus.ERROR, RegistryMessages.OWNER_NAME, 0, RegistryMessages.bundle_not_activated, null));
                 return null;
             }
             registryTracker = new ServiceTracker(context, IExtensionRegistry.class.getName(), null);
             registryTracker.open();
         }
         return (IExtensionRegistry) registryTracker.getService();
     }

     /**
      * Release OSGi tracker
      */
     public void release() {
         if (registryTracker != null) {
             registryTracker.close();
             registryTracker = null;
         }
     }
 }

